Authors Erber, M. ; Boye, S. ; Hartmann, T. ; Voit, B. ; Lederer, A.
Title A convenient room temperature polycondensation towrd hyperbranched AB2-type all-aromatic polyesters with phenol terminal groups
Date 06.10.2009
Abstract As a convenient alternative to the classical melt polycondensation the one-pot solution polycondensation of suitable AB2 monomers under mild conditions has been successfully adapted to hyperbranched all-aromatic polyester with phenol terminal groups. The polymerization was performed in solution at room temperature directly using commercially available 3,5-dihydroxybenzoic acid as monomer and 4-(dimethylamino) pyridinium 4-tosylate as catalyst to suppress the formation of N-acylurea. Different carbodiimides as coupling agents were investigated to find the optimal esterification conditions. The polymers have been characterized extensively and were compared with their well-known analogs synthesized in melt. The characterization was carried out by NMR spectroscopy, size exclusion chromatography, and asymmetric flow-field flow fractionation as an alternative separation technique for multifunctional polymers. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5158-5168, 2009
Journal Journal of Polymer Science: Part A: Polymer Chemistry 47 (2009) 5158-5168

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